To find the coordinates of a point across the line y=x, all you need to do is the point (x,y) write it like (y,x). So:
X(-5,-2) -> X'(-2,-5)
Y(-3,4) -> Y'(4,-3)
Z(-1,1) -> Z'(1,-1)
the coordinates:
X'(-2,-5)
Y'(4,-3)
Z'(1,-1)
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